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In synch steam exhaust

1431 Views 4 Replies 3 Participants Last post by  dwb, 
C
Hi again
Can anyone tell me if it's possible to set a sound chip to emit four beats per driving wheel cycle given a known gearbox reduction, 50/1 in my case. ie can a chip read the revs of the motor, divide by 50 then multiply by four ( or six for a Jub etc ). Also can anyone suggest a sound chip for steam that could fit under the cab roof or on the cab floor of kit-built stock, speaker to go in tender.
I have no DCC gear yet, but will start with Bachmanns Brush 4 in green with sound and their Dynamis, when it becomes available.
I've also got Bachmann 24,25 and 37 DCC ready. What chip and sound systems would anyone recommend and do you think that Bachmann will make retro-fit kits available?
Lots of questions from a DCC novice. Sorry
Thanks in advance for any advice.
Ste.
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Makemineadouble
what sound decoder ?
you can either use a cam which is a thin etch with a pick-up or use DDE (Dynamic Digital Exhaust) this is normally set-up in Cv 51- Cv 56 on soundtraxx decoders.
If you visit the Soundtraxx site you can download their manual which gives more detail. If you use Soundtraxx I'll post you my settings off list only.
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dwb
>can anyone suggest a sound chip for steam that could fit under the cab roof or on the cab floor of kit-built stock
I think that's a fairly tall order for today's sound decoders. The additional hardware needed to create the sound such as a flash ROM for storage currently make them larger than "silent" types. You are more likely to be able to mount the decoder in a similar position to the speaker, just make sure it's not impeding the sound waves.

David
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Makemineadouble
Impeding sound waves ?, I've installed in closed tender with no holes and the sound remains excellent, size of speaker, the bigger the better. A deep enclosure
is also the key to good resonance. Why don't you simply raise the roof to accommodate your sound decoder. You could disguise the loco as a double decker bus. The first sound decoders I installed were ESU decoders and I was hard pressed to fit them inside the body of a west Country with a speaker. Then I crumbed one in the tender of a Princess, but to me the trailing wires and routing them into the loco are always a problem. Of course today we have micro plugs and decoders have shrunk. Some but not all of them. I have sound in the crowded tender of a Q1, I attempted the Fowler tank but failed even with a tiny 1/2" speaker sound decoders remain large at present but it's the new frontier - for some. I'm currently installing Soundtraxx with excellent results
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dwb
> Impeding sound waves ?, I've installed in closed tender with no holes and the sound remains excellent
I was thinking more of the decoder being placed across the diaphragm of the speaker.

>I attempted the Fowler tank but failed even with a tiny 1/2" speaker
I'm surprised at that, given what seems to be a large volume over the trailing bogie but I take your word for it.

David
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